PIC18LF24K Datasheet, PDF (82/594 Pages) –

PIC18(L)F26/45/46K40
9.0 WINDOWED WATCHDOG
TIMER (WWDT)
The Watchdog Timer (WDT) is a system timer that
generates a Reset if the firmware does not issue a
CLRWDT instruction within the time-out period. The
Watchdog Timer is typically used to recover the system
from unexpected events. The Windowed Watchdog
Timer (WWDT) differs in that CLRWDT instructions are
only accepted when they are performed within a
specific window during the time-out period.
The WWDT has the following features:
• Selectable clock source
• Multiple operating modes
- WWDT is always on
- WWDT is off when in Sleep
- WWDT is controlled by software
- WWDT is always off
• Configurable time-out period is from 1 ms to 256s
(nominal)
• Configurable window size from 12.5% to 100% of
the time-out period
• Multiple Reset conditions
 2016 Microchip Technology Inc.
Preliminary
DS40001816C-page 82